150MA, LOW-NOISE LDO VOLTAGE REGULATOR
JANUARY 30, 2008
SPX5205
REV.
G
FEATURES
■
Low Noise Output LDO: 40μV
RMS
Possible
■
1% Initial Accuracy
■
Very Low Quiecent Current: 70μA
■
Low Dropout Voltage (210mV at 150mA)
■
Current and Thermal Limiting
■
Reverse-Battery Protection
■
Wide Range of Fix Output Voltages:1.2V, 1.5V,
1.8V, 2.0V, 2.5V, 2.8V, 3.0V, 3.3V and 5.0V
■
Zero Off-Mode Current
■
Small 5-Pin SOT-23
■
Pin Compatible to MIC5205/MAX8877
(fixed Options Only) and AS3815
Fixed Output Voltage
V
OUT
BYP
5
4
SPX5205
5 Pin SOT-23
1
V
IN
2
GND
3
EN
Adjustable Output Voltage
V
OUT
ADJ/BYP
5
4
SPX5205
5 Pin SOT-23
1
V
IN
2
GND
3
EN
APPLICATIONS
■
■
■
■
■
■
PDA
Battery Powered Systems
Cellular Phone
Cordless Telephones
Radio Control Systems
Laptop, Palmtop, and Notebook Computers
Now Available in Lead Free Packaging
■
■
■
■
Portable Consumer Equipment
Portable Instrumentation
Bar Code Scanners
SMPS Post-Regulator
DESCRIPTION
The SPX5205 is a positive voltage regulator with very low dropout voltage, output noise and ground current
(750μA at 100mA). V
OUT
has a tolerance of less than 1% and is temperature compensated. Fixed output
voltages 1.2V, 1.5V, 1.8V, 2.0V, 2.5V, 2.8V, 3.0V, 3.3V, and 5.0V and an adjustable version are available
in a small 5-pin SOT-23 package. Other key features include zero off-mode current, reverse battery
protection, thermal shutdown and current limit. The SPX5205 is an excellent choice for use in battery-
powered applications, and where powe
r conservation is desired such as: cellular/ cordless telephones, radio
control systems, and portable computers.
TYPICAL APPLICATION CIRCUIT
V
IN
1
5
V
OUT
2
+
GND
3
EN
ENABLE may be tied directly to V
IN
SPX5205
+ 1.0μF
4
BYP
(Optn)
TOP View
Exar
Corporation 48720 Kato Road, Fremont CA, 94538
•
(510) 668-7000
•
FAX (510) 668-7017
•
www.exar.com
SPX5205
150mA, Low-Noise LDO Voltage Regulator
REV. F
ABSOLUTE MAXIMUM RATINGS
Thermal Shutdown .................................................................... Internally Limited
Lead Temperature (Soldering, 5 seconds) ................................................. 260°C
Operating Junction Temperature Range .................................... -40°C to +125°C
Input Supply Voltage ......................................... -20V to +20V
Enable Input Voltage ......................................... -20V to +20V
RECOMMENDED OPERATING CONDITIONS
Input voltage ..................................................................................... +2.5V to 16V
Operating Junction Temperature Range .................................... -40°C to +125°C
Enable Input Voltage .............................................................................. 0V to V
IN
SOT-23-5 (
JA
) ................................................................................... See Note 1
ELECTRICAL CHARACTERISTICS
T
J
=25°C, V
IN
= V
OUT
+ 1V, I
L
= 100μA, C
L
= 1μF, and V
ENABLE
2.4V. The denotes the specifications which
apply over full temperature range -40°C to +85°C, unless otherwise specified.
PARAMETER
Output Voltage Tolerance (V
OUT
)
Output Voltage Temperature Coefficient
Line Regulation
Load Regulation
Dropout Voltage (See Note 2)
(V
IN
- V
O
)
MIN
-1
-2
TYP
MAX
+1
+2
0.1
0.2
0.2
0.5
50
70
190
230
250
300
275
350
1
5
125
150
600
800
1000
1500
1900
2500
500
UNITS
%V
NOM
ppm/°C
%/V
%
mV
mV
mV
mV
μA
μA
CONDITIONS
57
0.03
0.1
30
140
180
210
V
IN
= V
OUT
+ 1V to 16V
I
L
= 0.1mA to 150mA
V
IN
= V
OUT
+ 1V
≥
2.5V
I
L
= 100μA
I
L
= 50mA
I
L
= 100mA
I
L
= 150mA
V
ENABLE
0.4V
V
ENABLE
0.25V
I
L
= 100μA
I
L
= 50mA
I
L
= 100mA
I
L
= 150mA
Quiescent Current (I
GND
)
Ground Pin Current
(I
GND
)
0.05
70
350
750
1300
Ripple Rejection (PSRR)
Current Limit (I
LIMIT
)
Output Noise (e
NO
)
70
360
300
40
dB
mA
μV
RMS
μV
RMS
V
OUT
= 0V
I
L
= 10mA, C
L
= 1μF, C
IN
= 1μF
(10Hz - 100kHz.)
I
L
= 10mA, C
L
= 10μF, C
BYP
=
1μF,C
IN
=1μF,(10Hz - 100kHz)
OFF
ON
Input Voltage Level
Logic Low (V
IL
)
Input Voltage Level
Logic High (V
IL
)
ENABLE Input Current
0.4
2.0
0.01
3
2
20
V
μA
V
IL
V
IH
0.4V
2.0V
Note 1:
The maximum allowable power dissipation is a function of maximum operating junction temperature, T
J (max)
, the junction to ambient thermal
resistance, and the ambient, J
A
, and the ambient temperature T
A
. The maximum allowable power dissipation at any ambient temperature is
given: P
D (max)
= (T
J (max)
- T
A
)/ J
A
, exceeding the maximum allowable power limit will result in excessive die temperature; thus, the
regulator will go into thermal shutdown. The J
A
of the SPX5205 is 220°C/W mounted on a PC board.
Note 2:
Not applicable to output voltages of less than 2V.
2
SPX5205
REV.
G
150mA, Low-Noise LDO Voltage Regulator
TYPICAL PERFORMANCE CHARACTERISTICS
1.40
1.20
1.00
3.3V Device
V
IN
= 3.2V
C
L
= 1.0μF
110
100
90
I
GND
(mA)
0.80
0.60
0.40
0.20
0.00
0
50
100
150
I
GND
(μA)
80
70
60
50
40
30
4
6
8
10
V
O
= 3.3V
C
L
= 1.0μF
I
L
= 100μA
12
14
16
I
L
(mA)
Ground Current vs Load Current
V
IN
(V)
Ground Current vs Input Voltage
2.00
3.3V Device
V
IN
= 4.3V
C
L
= 1.0μF
3.340
3.335
3.330
3.325
1.50
I
GND
(mA)
V
OUT
(V)
3.320
3.315
3.310
3.305
3.3V Device
C
L
= 1.0μF
I
L
= 100μA
1.00
0.50
3.300
3.295
3.290
0.00
0
50
100
150
4
6
8
10
12
14
16
I
L
(mA)
Ground Current vs Load Current in Dropout
V
IN
(V)
Output Voltage vs Input Voltage
3
SPX5205
150mA, Low-Noise LDO Voltage Regulator
REV.
G
TYPICAL PERFORMANCE CHARACTERISTICS
3.310
200
V
O
=3.3V
V
IN
= 3.2V
C
L
= 1.0μF
3.308
3.3V Device
V
IN
= 4.3V
C
L
= 1.0μF
Dropout (mV)
150
V
OUT
(V)
3.306
100
3.304
50
3.302
0
0
50
100
150
3.300
0
50
100
150
I
L
(mA)
Dropout Voltage vs Load Current
I
L
(mA)
Output Voltage vs Load Current
90.0
V
OUT
= 3.3V
V
IN
= 4.3V
C
L
= 1.0μF
I
L
= 100μA
950
80.0
850
I
GND
(μA)
70.0
I
GND
(μA)
750
650
V
OUT
= 3.3V
V
IN
= 4.3V
C
L
= 1.0μF
I
L
= 100mA
-20
0
20
40
60
80
100 120
60.0
550
50.0
-40
-20
0
20
40
60
80
100 120
450
-40
Temperature (°C)
Ground Current vs Temperature at I
LOAD
=100μA
Temperature (°C)
Ground Current vs Temperature at I
LOAD
=100mA
4
SPX5205
REV.
G
150mA, Low-Noise LDO Voltage Regulator
TYPICAL PERFORMANCE CHARACTERISTICS
2.30
2.20
2.10
V
OUT
= 3.3V
V
IN
= 4.3V
C
L
= 1.0μF
I
L
= 150mA
3.400
3.380
3.360
3.340
V
OUT
= 3.3V
V
IN
= 4.3V
C
L
= 1.0μF
I
GND
(mA)
2.00
1.90
1.80
1.70
1.60
1.50
1.40
-40
V
OUT
(V)
-20
0
20
40
60
80
100 120
3.320
3.300
3.280
3.260
3.240
3.220
3.200
-40
-20
0
20
40
60
80 100 120
Temperature (°C)
Ground Current in Dropout vs Temperature
Temperature (°C)
Output Voltage vs Temperature
1.60
1.50
V
OUT
=3.3V
C
L
= 1.0μA
I
L
= 100μA
350
300
250
200
150
100
V
EN,
On Threshold (V)
1.40
1.30
1.20
1.10
1.00
0.90
0.80
4
6
8
10
12
14
16
uV RMS
Cin = 1uFT,
Cout = 1uFT
Cin = 1uFT,
Cout = 2.2uFT
Cin = 1uFT
Cout = 10uFT
50
0
1
10
100
1000
10000
Bypass Cap (pF)
100000 1000000
V
IN
(V)
ENABLE Voltage, ON threshold vs Input Voltage
Output Noise vs. Bypass Capacitor Value
5
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